Some little area or instance does not really sound like the large scale PvP they are talking about, so again I'm asking:
Why do you even think there would be large scale PvP?
Maybe some small PvP in some arena someday, sure, but large scale?
Although I actually like the idea of an arena to compete in

Because it means there's no stupid PvP in my everyday gameplay, but when I feel like it, I can go into the arena (which could have "tournaments" in different classes, like "easy" for 1-10, "not all that easy" for 10-20 and so on x)